The mounts are the least of the problems. They will interchange from block to block. If you are looking to keep that transmission and go to a bigger motor then forget about the newer 383 and get one from a 1959 to 1961 Mopar. You could even use a 413. If you get an older 383 just beware because they made it in a low block and a raised block version. I believe the 59 and 60 Windsor used an RB 383. The low block version you could use you parts from the 361 on.